A nurse in the emergency department is assessing a client who has a history of angina and reports chest pain. Which of the following findings is the priority?

Rationale: A. Three doses of nitroglycerin relieve the client's pain: While nitroglycerin can relieve chest pain related to angina, the fact that the pain subsides after three doses may indicate stable angina. However, this does not address the underlying concern if the pain began at rest, which is more concerning. B. Pain radiates to the client's left arm: Pain radiating to the left arm is a common symptom of angina or myocardial infarction (MI). While this is concerning, it is not the most urgent finding compared to the pain onset, especially when pain occurs at rest. C. Pain began in the morning while the client was resting: Chest pain occurring at rest, especially in the morning, is the most concerning symptom. This could indicate unstable angina or an impending myocardial infarction (MI). Unstable angina is more dangerous than stable angina and requires immediate intervention. D. Pain is greatest in the client's substernal chest area: Substernal chest pain is characteristic of angina, but it is not as concerning as the timing of pain onset. Pain at rest, especially in the morning, suggests unstable angina or MI, which is a higher priority.